Wireless Repeater Commissioning
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Transcript of Wireless Repeater Commissioning
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7/29/2019 Wireless Repeater Commissioning
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2011 Comba Telecom. All Rights Reserved
www.comba-telecom.com
Wireless Repeater
Commissioning
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2011 Comba Telecom. All Rights Reserved
STEPS
Select signal source
Test the isolation between donor antenna and service antenna
Adjust repeater downlink/uplink gain to obtain appropriate downlink output
power and minimum uplink interference
Set the monitoring parameters
Drive test
BTS
Repeater
UMTS
http://foma.nttdocomo.co.jp/english/term/d2101v_01.html -
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SELECT SIGNAL SOURCE - GSM
The donor signal can couple from Macro BTS , Micro BTS or repeater.
Band selective repeater :
Input power of BCCH > Rated output power - 10lgN System gain
Channel selective repeater :
Input power of BCCH > Rated output power of channel System gain
C/I higher than 9dB
BCCH power > neighbor cells BCCH + 10dB
BCCH TCH TCH TCH
BCCH
TCH
Power
Capacity
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SELECT SIGNAL SOURCE - WCDMA
Band selective repeater :
Input power of each CPICH > rated output power - 10lgN - 10dBsystem gain.
Channel selective repeater :
Input power of CPICH > rated output power - 10dB system gain.
Ec/Io higher than -7dB.
Ec(CPICH)=10%
cch=10%
tch=80% Maximumpower=100%
Ec(CPICH)=10%
cch=10%Idlepower=20%
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OPERATING FREQUENCY CONFIG.
Bandwidth adjustable repeater:
set upper edge and the lower edge of the band.
Center frequency adjustable repeater:
set the center frequency of operating band.
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OPERATING FREQUENCY CONFIG.
Channel selective repeater:set channel numbers
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Isolation(PT-PR) Gainmax+15dB
Use SiteMaster to test the isolation between Donor antenna and Serviceantenna
Or calculate the isolation according to path loss (Lw), gain of antennas (Gd, Gr),antenna front-to-rear ratios (Xd, Xr), separation between donor and serviceantenna (d), antenna wave length ().
Horizontal Isolation: Ih=22+20lg(d/-Gd+Gr+(Xd+Xr)+LwVertical Isolation: Iv=28+40lg(d/)+Lw
ISOLATION REQUIREMENTPath Loss LW
PR PT
G
P
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Typical values
Note: Gd=Gr=15dB,Xd=Xr=25dB,
Lw=0,
f=900MHz
ISOLATION REQUIREMENT
d(m) 5 10 15 20 25 30
Ih(dB) 65.6 71.6 75.1 77.65 79.6 81.2
Iv(dB) 75 87.2 94 99.2 103.2 106.4
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GAIN SETTING - DOWNLINK
Set DL ATT according to the DL input power and the target DL output power.
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GAIN SETTING - DOWNLINKFor manually controlled repeater, user can set the ATT by DIP switch or
control panel
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GAIN SETTING - UPLINKThe uplink noise level arriving from the repeater to the BTS
Nu = Nth-rr+ Grr+ NFrr- EDoPL
*Nth-rr = thermal noise of a GSM channel (-121 dBm @ 20C)Grr= uplink gain setting of repeater
NFrr= repeater noise figure (typ 5 to 9 dB)
To minimize noise interference at the BTS, let Nu be 3 dB less than thermalnoise of BTS, Nth-bts; i.e.
Nu = -(121+3) = -124 dBm
Assuming NFrr = 7 dB, the maximum repeater gain setting is determined byNu = Nth-rr + Grr + NFrr - EDoPL -124
= -121 + Grr + 7 - EDoPLGRULmax = EDoPL 10dB
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GAIN SETTING - UPLINK
Set Uplink ATT according to EDoPL
Generally speaking, In applications of wireless repeater, we can setthe Uplink gain is 3~5dB less than Downlink gain.
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MONITORING PARAMETERS
Alarm threshold:
Generally, these parameters have been pre-configured with default values,user can change the value according to the actual requirements
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MONITORING PARAMETERS
Site information setting:Set Site ID and Site Sub ID
Note: it is a must to set the site with unique Site ID for remotemonitoring
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MONITORING PARAMETERS
Communication parameters configurationE.g. report phone number, OMC IP address, PS Domain parameters, etc.
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MONITORING PARAMETERS
Alarm parameters
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DRIVE TEST
After finishing the commissioning, perform drive test to measure the coverage
improvement.
For GSM:
Rx Level
Rx Qual
TA
Tx Power C/I
FER
For WCDMA:
RSCP
EC/IO BER
Tx Power SIR target
Data rate
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CONTACT US
Email us at:
Or visit our website for local office details at:
http://www.comba-telecom.com
mailto:[email protected]://www.comba-telecom.com/http://www.comba-telecom.com/http://www.comba-telecom.com/http://www.comba-telecom.com/mailto:[email protected]:[email protected]:[email protected] -
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Thank You